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For CatsImmune Lysine+ Powder

Immune Lysine+ Powder

Advanced L-lysine for cats — eye and respiratory immune support, scooped straight onto food.

Made for catsZero fillersVet-formulatedMade in North America
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One-time purchase$27.99
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1
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Will my pet actually take it?
Most pets take it readily thanks to the real-food base and taste. If yours is the exception, the 30-Day Happy-Pet Guarantee has you covered.
How long until I see results?
Most pet parents notice a difference within 2–4 weeks of daily use. Full results build over 6+ weeks — which is exactly why subscribers see the best outcomes.
Directions & dosing
Follow the serving guide printed on every pack. Start with a lower serving for the first few days if your pet is very sensitive, then move to the full daily amount.

What you'll notice

A happier, healthier pet

Everyday defense
More vitality
Antioxidant support
Whole-body wellness
What's inside

The real-food actives

Every active is chosen for what it actually does — and dosed at a level that matters.

L-Lysine HCl

L-Lysine HCl

An amino acid that supports feline immune defense.

Eye-Health Support

Eye-Health Support

Helps maintain healthy eyes and respiration.

Immune Boost

Immune Boost

Everyday support for cats of all ages.

No Fillers

No Fillers

Just the active — nothing your cat doesn't need.

Why it works

Everyday immune defense

A resilient immune system is built daily — with whole-food mushrooms, vitamins and antioxidants.

1

A daily assault

The immune system fends off pathogens and everyday stress around the clock.

2

Defenses dip

Under-supported, those defenses drop and small bugs turn into real setbacks.

3

Prime the defense

Mushroom beta-glucans prime the immune cells, while antioxidants shield them from daily damage.

4

Resilience compounds

Built consistently, a resilient immune system holds the line year-round.

The real-food timeline

What to expect, week by week

Week 1

Settling in

Everyday support begins as actives build in the system.

Weeks 2–4

Finding balance

Energy and vitality steady with consistent daily use.

Weeks 6+

Thriving

A resilient immune baseline is established for the long run.

The clean promise

Everything they need. Nothing they don't.

Every active is listed with its real dose — and we're just as proud of what we leave out.

We refuse to use:

Fillers & bindersArtificial colorsArtificial flavorsSynthetic dyesCorn, wheat & soyChemical preservatives
Immune Lysine+ Powder
60 verified reviews

Real pets. Real results.

4.8
★★★★★
60 reviews · 97% recommend
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Verified reviews
★★★★★✓ The sneezing stopped

"My cat had chronic sneezing fits for months. A couple weeks of the lysine powder and they have almost completely stopped."

OM
Odette M.Verified
Ragdoll · 5 yrs
★★★★★✓ Watery eyes cleared

"His eyes were constantly runny and crusty. Since scooping lysine on his food they are clear and bright again."

GB
Gideon B.Verified
Maine Coon · 7 yrs
★★★★★✓ Fewer flare-ups

"My rescue kitty carries the feline herpes virus. Daily lysine has cut her respiratory flare-ups way down."

SK
Simone K.Verified
Tabby · 3 yrs
★★★★★✓ Easy to feed a cat

"Pilling a cat is impossible, but this powder disappears into wet food. She eats it and her immune health is better for it."

RD
Rowan D.Verified
Siamese · 6 yrs
★★★★★✓ Stronger through kitten season

"I have three cats and colds used to spread fast. Lysine keeps their defenses up and the sneezing at bay."

BS
Beatriz S.Verified
Domestic Shorthair · 2 yrs
★★★★★✓ No fillers, just the amino

"I love that it is pure L-lysine with nothing junky added. My senior cat is more comfortable and his eyes look great."

CR
Callum R.Verified
Persian · 10 yrs
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Before you ask

Questions, answered

Is it safe to give every day?
Yes. It's formulated for daily use and made in a GMP-certified facility in North America. Every batch is made in small runs with clinically-meaningful, printed-on-pack active levels.
Can I give it with other Petpal formulas?
Absolutely — they're designed to stack. And our ready-made Bundles save you 20% automatically at checkout.
My pet is sensitive — where do I start?
Start with a half dose for the first 3 days if your pet is very sensitive, then move to the full daily serving.
What if it doesn't work for us?
Then it's free. The 30-Day Happy-Pet Guarantee means you can return it — even empty — for a full refund, no questions asked.
Pairs well with

Complete their routine

Immune Lysine+ Powder
Immune Lysine+ Powder
Subscribe & save 20% · $22.39/jar